Ultrasonic velocity in suspensions of solids in solids-a comparison of theory and experiment

Twelve theoretical models for the ultrasonic velocity in a system consisting of a solid matrix containing solid spherical inclusions have been compared with experimental data obtained from the literature. Four of the models failed to predict the experimentally observed minimum in the velocity-inclusion concentration curve, and can therefore only be considered suitable for low-concentration computations. All of the remaining models give qualitative agreement with the experimental systems considered and no one model is obviously superior to the others. There is a clear need for more high quality experimental data on solid-solid suspensions.